Tuft cutter mechanism for axminster carpet and like looms



E. J. PERRY Nov. 27, 1934.

TUFT CUTTER MECHANISM FOR AXMINSTER CARPE'T AND LIKE LOOMS Filed Aug. l2, 1935 Pzitented Nov. 27, 1934 UNITED STATES TUFT CUTTER MECHANISM FOR AX- MINSTER CARPET AND LIKE LOOMS Ernest Joseph Perry, Birmingham, England -j Application August 12, 1933, Serial No. 684,795 In Great Britain August 20, 1932 1l claim.

i 5 The object is to provide a tuft cutter mechanism which shall be relatively cheap and light and of a unitary construction having an entirely enclosed blade device, the mechanism therefore being particularly safe in use as well as being highly efficient and expeditious in operation.

According to the present invention the tuft cutter mechanism is characterized by a blade device which is operable between a facially opposed pair of combs adapted to accommodate a row of tuft yarns in successive pairs of tooth spaces, the

blade device and the pair of combs being relatively slidable for the cutting operation, andthe blade device being entirely enclosed within the pair oi combs at all stages of the cutting operation.

In order that this invention may be clearly understood and readily carried into practice, reference may be had to the appended explanatory sheet of drawing, upon which:-

l Figure l is a plan of a tuft cutter mechanism incorporating the present improvements, the view being broken and its lower part having the front comb removed to show the interior construction, said lower part also illustrating both the cutting and the non-cutting positions of the blade device.

Figure 2 is a sectional end elevation of the tuft cutter mechanism, the section being taken on a plane indicated by the line II-II of Figure l.

Figures 3 and 4 are sectional end elevations of the tult cutter mechanism in accordance with modified forms of the invention.

In one method of carrying the invention into` effect, as illustrated in Figs. 1 and 2, a pair of combs a b of straight solid metal bar formation are disposed in facially opposed relation with their respective series of teeth a1 b1 in register, the combs being rigidly secured together in this precise relation, for instance by a series of dowels c and screws d adjacent the edges remote from the teeth. The combs a b are recessed in shallow rectangular form on their abutting faces to provide an interior chamber e of rectangular crosssection extending longitudinally from end to end, this chamber communicating with a clearance -`slot f between the registering series of teeth a1 b1 of the two combs. Located longitudinally within the interior chamber e, and projecting slightly from its ends, is a straight carrier bar g of a width somewhat less than that of the chamber,

this bar g being fitted with a plurality of cutter blades h projecting obliquely in spaced parallel succession from its outer edge in such a manner that the outer parts of the series of blades are accommodated within the slot f, in a position normally clear of the bases of the teeth a1 b1. These cutter blades h may be provided for example in the form of doubled-edged safety-razor blades having the usual three locating holes, each blade being detachably secured in position by means of a locating screw or pin i engageable into the central hole and a screw i engageable into the innermost hole, in conjunction with a small clamping or cover plate k fitted facially over the inner part of the blade, or with an alternative` elongated clamping plate embracing a plurality of say twelve of the blades. The blade carrier bar is adapted for a suitably imparted reciprocating motion within the interior chamber e of the combs under control of guide devices each consisting l for example of a pin Z slidable within a slot m, the slot being of angular, arcuate, or inclined formation so that the reciprocating motion is in a combined longitudinal and oblique direction, and so that on the outward stroke of the bar g, as indicated at g1 in Fig. 1, the series of blades h approach and sweep across the bases of the comb teeth a1 b1, as illustrated at h1 in Fig. l, to effect the cutting operation, after which the blades h are retracted into their normal position clear of the teeth by the return or inward stroke of the bar. The cutter blades h, when of the safetyrazor type referred to, are reversible in four different settings for the purpose of maintaining a highly eiiicient cutting action, and the mechanism is particularly safe in use by reason of the cutter blades being at all times entirely enclosed between and within the pair of combs a b.

In the modications illustrated in Figures 3 and 4 the tuft cutter mechanism is similar in construction and operation to that already described except that it is built up with combs a2 b2 of pressed sheet-metal formation, rigidly secured together upon a foundation bar 1i by screws d1, each of these pressed combs being preferably of sectional construction, with the component sections of opposed combs disposed in staggered relation.

It will be appreciated that any convenient form of knife or blade device may be used within the interior chamber of the combs, and that the reciprocating movement of the knife or blade device may be governed by links or other means as an alternative to the pin-and-slot guide. Moreover the relative movement between the blade device and the combs may be obtained by imparting the oblique or partly oblique reciprosovv clearance slot between the two series of comb teeth, said blade device consisting of a row of safety-razor blades mounted detachably and reversibly upon a carrier bar by plate-like clamping means, and said blade device being normally clear of the teeth but being adapted to approach and sweep across the tooth bases to out said row of tuft yarns, and being entirely enclosed at all stages of the cutting operation.

ERNEST JOSEPH PERRY. 

